Pushbutton lock



FIG. 1 is a perspective view of the pushbutton lock of the present design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a right side elevational view thereof.

The left side elevational view of the pushbutton lock shown in FIG. 1 is a mirror image of the view of FIG. 3. 

The ornamental design for a pushbutton lock, as shown and described. 